dunlop



PATENTED FEB. 16,'1904.

. J. B. DUNLOP & J.. B. DUNLOP, JR.

EXHAUST SILENCEE FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED APR.30,1903.

N0 MODEL Patented February '16, 1804.

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JQHN B. DUNLOP AND, JoHN B, DUNLOP, a., or DUBLIN, IRELAND.

EXHAusT-suENcEe FOR lNTERNAL-COMBUSTION ENGINES.

summation To all whom it may concern:

Be it known that we, J OHN Born DUNLOP and J om: BOYD DuNLor,,Jr., subjects of the King of England, residing at Dublin, Ireland,

have invented certain new and useful Improvements in or Relating to Exhaust-Silencers for Internal-Combustion Engines, of which the following is a specification.

This invention relates to exhaust-silencers for internal-combustion engines, and has for its chief object to produce an improved silencer for reducing the noise of the exhaust and to allow the burned gases to escape freely.

According to this invention the silencer.

- or more conduits, the openings in which are so situated that the gases entering one chamber expand therein before reaching the conduit leading to the next chamber.

In carrying out this invention there-is provided a box or casing in the formof a cylinder, which is preferably divided into two or more compartments by means of internal disks or plates. There is also provided a tube which passes through the compartments; The cylinder may be secured in position by means of a clip, and the tube is secured to the ex haust-pipe of the engine by means of a 'clip' or otherwise. Within each compartment two holes are cut in the opposite sides ofthe tube, and a disk, cone, cup, or other suitable baflle or stop is placed in the tube between the two holes, so as to cause the gases in'their passage to pass out of the tube into the chamber and after expanding therein back into the tube through the other hole and into the next ex-. pansion-chamber. For simplicity of manufacture preferably one tube only. is employed and the disks are connected to the tube in any convenient manner and are placed in an oblique or inclined position. In place of one ducing the" back pressure.

tube two or more tubes maybe employed and .disk or disks D divide the cylin er into com--- is divided into a series of compart-' forming part of Letters Patent No. 752,386, dated February 16, 1904.

Application filed April 30, 1903. 7 Serial No. 155,043. memorial.)

the gases caused to pass through one tubeto enter in each compartment. The outlet and inlet holes which are in the sides of the tube. are turned awayfrom each other in order to cause the gases to divide around'the tubes and to unite again on'entering, and thus break up the sound-waves.

Referring to the drawings, Figure 1 is a longitudinal section of the silencer divided into three compartments or chambers and having one tube, and Fig. 2 is a similar view of a silencer having two chambers or compartments and two tubes.

Referring more particularly to Fig. 1, A is the tube, and Bis the cylinder. C represents the end disks or plates.- D represents the internaldisks or plates dividing the cylinder into compartments B and held in position by lining cylinders or sleeves'E. F represents disks or plates having lugs which are riveted to the tube and direct the flow of the gases. out' of the tube through the opening mule gases passing into the tube again by the openmg a.

Referring now to Fig. 2, the tube A passes through the cylinder B eccentric thereof and has one internal disk or .plate G held in position conveniently by two pins g, as shown The second tube A is mounted within the casing preferably diametrically opposite to the tube A'and extends from one compartment to the other, having its ends closed. The exhaust-gases pass out of the tube A through holesa, as shown by the arrows, and into the tube A through the openings a in the same compartment and out of the tube-A by the openings a in'thesecond compartment and 'back into the tube A through openings at, v finally escaping from the tube, as shown by the arrow.

The disks or plates D inaddition to having advantage be perforated with very small holes. These perforations allow a small portion of the exhaust-gases to pass directly from one chamber to another and have the effect 'of further breaking up the sound-waves and re- In all cases the a hole or holes for the tube or tubes may with still partments, .so as to cause the whole or nearly the whole of the gases to pass through the disk ordisks D by the tube A or A.

What we claim as our invention, and desire to secure by Letters Patent, is-

,1. In an exhaust-silencer, the combination I with a ceasing, of a partition, forming compartments within the casing, a tube extending through the partition and having openings in its side walls on opposite sides of the partition, and a baflie arranged transversely across the interior of the tube between openings therein.

2. In an exhaust-silencer, the combination with a casing, of partitions dividing the casmg into a series of compartments, a tube ex tending through all, of the compartments and I havingwithin each a-pluralityof openings in its side Walls, and batfies arranged within said tube and dividing it into sections each having two or more'of said openings in its side walls.

3. In an exhaust-silencer, the combination wlth a caslng, of partitions dividing the easing into. compartments, sleeves within said compartments holding the partitions in position, a tube extending through the casing and establishing communication between the comverse partition, atube extending through the casing and the said partition, and having the eompart'mentfs' 'on both sides of the parti tions, and a second tube closed at its ends, .extending through I the, partition and provided with a series of openings in each compartment betweenwhich the partition is arranged.

6. In an exhaust-silencer, the combination with a casing divided into two compartments by a central partition, sleeves holding the partition in position, a tube extending through the casing and having openings communicating with each compartment, a baflie dividing the tube into two' parts, and a second tube having closed ends and two series of openings communicating with the respective compartments substantially asdcscribed.

7. In an exhaust-silencer, the combination with a casing divided into two compartments by a central partition, sleeves holding the partition in position, a tube extending through the casing and having openings communicating with each compartment, a baflie dividing having closed ends and two series of openings communicating with the respective compartments, the openings in the two tubes being described or illustrated in the accompanying drawings.

In testimony whereof we have signed our "names to this specification in the presence of two subscribing witnesses.

J. B. DUNLOP. J. B. DUNLOP, J UNR.

Witnesses: A

F. W. K. WILSON,

ROBT. RUXTON.

openings in its side walls communicating with tion, a bafiie dividing the tube into two sec- ,the tube into two parts, and a second tube turnedaway from each other, substantially as 

